针对不同埋深的隧道振动台试验设计研究

发布时间：2018-01-14 15:14

本文关键词：针对不同埋深的隧道振动台试验设计研究　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着我国经济的腾飞发展,加快对西部山岭地区的开发愈发显得日渐紧迫,因此,我国隧道工程的建设就被带动了起来。出于防灾减灾的需要,对隧道工程开展抗震设计方法的研究正逐渐得到学术界的关注,且得出了隧道埋深对其抗震性能具有明显影响的共识。然而目前公路隧道的抗震设计规范仍然采用静力分析方法作为划分隧道深浅埋的依据,难以充分反映地震发生时的动力特性,并且不同埋深隧道的地震作用参数和计算公式也有待修正。计算机和数值模拟软件的快速发展,给解决这类问题提供了一种处理办法,且目前已提出了多种算法,然而由于各类软件原理的不同,以及其他多种因素,经常导致对同一项目的不同模型或计算方法得出的结果存在明显差别,且很难判定孰是孰非。而模型试验正是解决这一问题的有效手段,本项研究旨在采用波动理论方法,通过振动台模型试验,分析不同埋深隧道衬砌的地震响应规律,了解衬砌受力与其埋深之间的相互关系,以便为检验理论计算结果的正确性,改进计算模型和隧道动力深浅埋的划分方法提供参考,进而为制定隧道抗震设计指南等提供依据。针对本试验的特点,本文通过对相似理论的分析,拟定了试验模型相似比；通过对多种模型箱类型的对比,确立了模型箱的合理构造形式、设计布局和边界条件的处理方式；通过对相似试验模型材料的论证,分别得出了围岩模型、隧道衬砌模型的相似材料及其配比；通过对试验客观条件的探讨,确定了模型试验中传感器的布置原则及位置,制定出了一套行之有效的在振动台上进行模型箱、围岩、衬砌、传感器的组装、填筑、施作、布设的方案。最终,在三种地震波共计21种工况的作用下,对处在不同埋深的衬砌模型进行了振动台试验。得到了以加速度时程、衬砌模型结构应变以及围岩动态土压应力为代表的试验数据,并依此分别得出不同埋深隧道衬砌模型的加速度放大系数、结构应力、围岩应力的变化特征。通过对这部分数据进行分析,得出了一些数据随埋深的突变点,为隧道深浅埋的动力划分提供了参考。
[Abstract]:With the rapid development of China's economy development, accelerate the development of the western mountainous areas is increasingly increasingly urgent, therefore, the construction of the tunnel project in China was brought up. The need for disaster prevention and mitigation, research on seismic design method of tunnel engineering has been the academic attention, and that is obviously deep influence on the seismic performance of the tunnel. However, the current consensus on the code for seismic design of highway tunnel is still using the static analysis method as the division tunnel buried depth of foundation, difficult to fully reflect the dynamic characteristics of earthquake, earthquake parameters and calculation formula and different depth of the tunnel should be corrected.
The rapid development of computer and numerical simulation software, provides a way to solve this kind of problem, and the current various algorithms have been proposed, but due to the different principle of all kinds of software, and many other factors, there are significant differences that often lead to the same project different model or method of calculation results, and it is difficult to judge right and wrong. While the model test is an effective means to solve this problem, this study aims at using wave theory method, through the shaking table test of seismic response of different buried depth of tunnel lining, lining stress and understand the relationship between the buried depth, the correctness of the calculation results is to test the theory. An improved calculation model and the dynamic classification method of tunnel buried depth of reference, and provide the basis for the development of tunnel seismic design guidelines.
According to the characteristics of the test, based on the similarity theory analysis, model test similarity ratio was drawn up; by comparing several types of box model, establish the reasonable structure of model box, processing design layout and boundary conditions; based on the similar material model test demonstration, the model of surrounding rock are obtained, similar the material and the ratio of tunnel lining model; through the discussion on the test of objective conditions, determine the layout principles and position sensors in the model test, to develop a set of effective vibration table of model box, surrounding rock, lining, sensor assembly, filling, construction, layout scheme.
Finally, in the three kinds of seismic waves under the action of a total of 21 cases, the shaking table test model in different depth of lining are obtained. The acceleration test, data structure and lining strain model of rock dynamic soil stress as the representative, and then calculated with the buried depth of tunnel lining model the acceleration amplification coefficient, structure stress, variation characteristics of surrounding rock stress. Through this part of the data analysis, the mutation point of some data with depth, which provides a reference for the division of power tunnel buried depth.

【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U451.5

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